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Pinpoint Test D: The Headlamps Are On Continuously

WARNING: This page is about a different car, the 2004 Ford Ranger. However, it is still accessible from the selected car via links, so may be relevant.
  1. D1 CHECK THE HEADLAMP SWITCH 
    NOTE: Make sure the multifunction switch is in the low beam position
    • Key in OFF position.
    • Disconnect: Headlamp Switch C205.
    • Do the headlamps continue to illuminate? 
    1. Yes  : GO to D2.
    2. No  : INSTALL a new headlamp switch. REFER to LAMP SWITCH - HEADLAMP . TEST the system for normal operation.
  2. D2 CHECK THE MULTIFUNCTION SWITCH 
    • Disconnect: Multifunction Switch C202b.
    • Do the headlamps continue to illuminate? 
    1. Yes  : If the high beams are illuminated, GO to D6.

      If the low beams are illuminated, GO to  D4.

    2. No  : GO to D3.
  3. D3 CHECK CIRCUIT 164 (VT/LB) FOR A SHORT TO POWER 
    • Measure the voltage between the multifunction switch C202b pin 8, circuit 164 (VT/LB), harness side and ground.
      Fig 1: Checking Circuit 164 (VT/LB) For A Short To Power
      G03277184Courtesy of FORD MOTOR CO.
    • Is any voltage present? 
    1. Yes  : REPAIR the circuit. TEST the system for normal operation.
    2. No  : INSTALL a new multifunction switch. REFER to STEERING COLUMN SWITCHES . TEST the system for normal operation.
  4. D4 CHECK CIRCUIT 13 (RD/BK) FOR SHORT TO POWER 
    • Disconnect: SJB C2280c.
    • Do the headlamps continue to illuminate? 
    1. Yes  : GO to D5.
    2. No  : REPAIR the circuit and test the system for normal operation.
  5. D5 CHECK THE SJB FOR A SHORT TO POWER 
    • Disconnect: SJB C2280a.
    • Do the headlamps continue to illuminate? 
    1. Yes  : If RH headlamp, REPAIR circuit 1056 (DB/LG). TEST the system for normal operation. If LH headlamp, REPAIR circuit 1055 (WH/LG). TEST the system for normal operation.
    2. No  : GO to  D9.
  6. D6 CHECK CIRCUIT 632 (GY/OG) FOR SHORT TO POWER 
    • Disconnect: SJB C2280b.
    • Do the headlamps continue to illuminate? 
    1. Yes  : GO to D7.
    2. No  : REPAIR circuit 632 (GY/OG). TEST the system for normal operation.
  7. D7 CHECK CIRCUIT 12 (LG/BK) FOR SHORT TO POWER 
    • Disconnect: SJB C2280a.
    • Connect: SJB C2280b.
    • Do the headlamps continue to illuminate? 
    1. Yes  : REPAIR the circuit. TEST the system for normal operation.
    2. No  : GO to D8.
  8. D8 CHECK CIRCUIT 932 (GY/LB) FOR SHORT TO POWER 
    • Observe the high beam indicator.
    • Is the high beam indicator illuminated? 
    1. Yes  : REPAIR the circuit. TEST the system for normal operation.
    2. No  : GO to D9.
  9. D9 CHECK FOR CORRECT SJB OPERATION 
    • Key in OFF position.
    • Disconnect all SJB connectors.
    • Check for:
    • Corrosion
    • Pushed-out pins
    • Connect all SJB connectors and make sure they seat correctly.
    • Operate the system and verify the concern is still present.
    • Is the concern still present? 
    1. Yes  : INSTALL a new SJB. REFER to MULTIFUNCTION ELECTRONIC CONTROL MODULES . TEST the system for normal operation.
    2. No  : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
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